Portable revolving baker&#39;s gas-oven.



No. 885,702. PATENTED APR. 21, 1908. S. STEWART.

PORTABLE REVOLVING BAKBRS GAS OVEN.

APPLICATION FILED JAN.17. 1907.

' 4 SHEETS-SHEET 1.

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PATENTED APR. 21, 190k.

S. STEWART. PORTABLE REVOLVING BAKER'S'GAS OVEN.

APPLICATION FILED JAN.17. 1907.

4 SHBETSSHEET 2.

' 4% 9L afwm w 0W M No. 885,702. v PATENTED APR. 21, 1908.

- s. STEWART.

PORTABLE REVOLVING BAKERS GAS OVEN.

APPLICATION FILED JAN. 1'7. 1907.

4 SHEETS-SHEET 3.

i m- M N ml S. STEWART.

PORTABLE REVOLVING BAKERS GAS OVEN.

' APPLICATION II-LEID JAN. 17. 1907.

PATENT-ED APR. 21, 1908.

4 SHEETS-SHEET 4.

1 scribed and To all whom it may concern:

UNITED STATES s' UEL STEW RT; or NEWARK, NEW JERSEY.

Pon'rABLEfREvoLvINe BAR-Ems ens-ovnn- Be it known that I, SAMUEL STEWART, a citizen of'the United States, residin at 151 herman avenue, Newark, county 0 and State of NewJersey, have invented certain new and useful Improvements in Portable Revolving Bakers Gas-Ovens, fully derepresented in the following specification and the accompanying" drawmgs, forming a part of-the same. The object of this inventionis to furnish a revolving gas oven for bakers use which can be manufactured, shi ped and set up for use without brickwork, feundation, or any attachment except the application of power to rotate the reel. To accomplish these objects, gas is used as fuel, and the oven embraces a casing with a longitudinal'openin'g in the extreme bottom part, a series of burners disposed beneath such opening, a doorforaccess to the shelves, and ventilating'passages formed adjacent to the end heads of the casing; A

The invention will be understood by reference to the annexed drawing, in which Figure 1 is a front view of the entige device with:the door open; Fig. 2 is a cross section on line 2, 2, in

The casing is shown with sides a, with to b and with bottom 0 having a central longltudinal opening (1 beneath. which two rows of burners e are'shown, but not extended uite to the ends or heads f of the casing. gne of the sides a, has a door 9 in its upper part extending the whole length, for access tothe reel. A reel-shaft his extended through the heads and carries reel-heads i within the heads, having headed ivot-studs 7' pro'ected from, their, adjacent aces, with the shelves zhung thereon by slotted shelfhangers" Z. The shelf-han ersare formed with. openings at below thes ots m, by, which they are introduced over the heads of the pivots, the weight ofthe shelves thenhold- 111g theslots in engagement withfthe pivots.-

The-reelheads t areshown of spider form with arms 72., but may be made-of solidplates or with :arms alone, as anystructureis equlvalent which carries. the pivots as shown.

. Specification of Lettei sfatent. Application filed January 17, 1907. Serial No.

Essex,

ig. 1; and is'a verti cal section on line 3', 3, in Fig. 2.

sat -tad. April 21, 1968..

The sides and top ofthe casing are formed of two sheets of metal a, a, and b, b, with a layer ofany non-radiating and lDCdmbllSth heads f are not proing the operation of baking. Such fiues are smaller than the heads, and secured thereto with intermediate ribs. which space them from the heads suflicien; ly for the downward passage of the gases. inlets 1; and s at the edges andtop, and an outlet t at the bottom of the'heads. The

condensed, because the heads not being 'totected from radiation are materially co der than the interior of the casing. The rows of burners are not extended to the ends of the opening d, to avoid any upwardcurrent of gas at the ends, and thus permit the escape of the chilled gases as they pass from the flueoutletthrough the ends of the opening it.

, Iron leg-frames u are shown attached to the heads to rest upon the floor, and support the burners by means of frame-bars 'u The shaft 11 which is shown connected with the reel-shaft h by gears 12. The motor-shaft is shown provided with fast and loose drivingpulleys w, to, but it is obvious that an electric motor or any other agency may be used to rotate themotor shaft.

Fig. l'shows the door open and pans wset upon the shelf in frontof the door, thus illustrating'the facility for loading and unloading thereel. T

Eight 'shelves are shown hungupon the reel, and the length of such shelves maybe varied tjo suit the requirements, soas to make the oven of'any desired oapacity. a

The waste gases are discharged through the downward fiues next the heads f, and are thus retained in the oven until they are chilled sufficiently to pass'dovmx'vard, whereby greatfeconom'y of operation is secured, so that in practical operation eighty 2 lb. loaves of bread can be baked in fifty minutes with only 100 feet of gas.

ble'material like asbestos or magnesia b"e' the escape of'the gases, which burners, in' contact with the damp bread dur- I formed by the use of flue-plates p somewhat" -The flue-plates are proportioned to leave" leg-frames also furnish a bearing fora motor-- gases enter at the inlets when chilled and The whole structure is exceedingly light in weight, and is thus readily trans orted, and

may be erected upon. any floor a building,

'.they are chilled to a very great extent, and it therefore radiates but a very little proportion of the heat which is furnished.

The burners are shown of the tubular form represented in my prior patent No. 407,134 dated July 16, 1889, which burners are very cheap in construction because made wholly of sheet metal and wire cloth, and as separate burners are used with a separate cock to sup ly each with gas, the heat can be perfect y regulated and proportionedto the quantity and rate of baking to be done.

It has been found advantageous to form the shelves with numerous perforations to permit the direct contact of the rising hot gases with the bottoms of the pans. This is readily effected by connecting the shelfhangers l by angle tie-bars y with their horizontal flanges disposed toward one another, and supporting upon such flanges the ends of gratings 2, made in sections, as shown in Fig. 4,.so as to fill the space between the heads.

Fig. 4 shows the grating z lying loosely upon the bottom flanges of the angle-bars y,

. and Fig. 7 shows the side flanges of the bars projecting slightly above the tops of the gratmgs to form stops for the ends of the baking an. The flanges of the tie-bars thus perorm the double function of su porting the gratings detachably, and of hol ing' the pans in place upon the shelves during their movement. This function of the flanges is indicated by the dotted lines a: in Fig. 7, representing the same pans which are shown in Fig. 1 secured together by straps as in groups or bunches of five to facilitate their removal from the shelves.

It is found in practice that this construction of oven is quite portable, and is so light in weight that it may be laced upon any floor of a building where t ere is plenty of light, air and sunshine, and coolness compared with the temperature of the cellars in which brick baking ovens are commonly erected. Such lightness of weight in a reel oven is secured partly by the use of gas, which dispenses witha coal furnace, and partly, by the use of a metallic casing having a non-heat-conducting jacket, and secures far more cleanliness and healthfulness in the bread which is baked, by ermitting the oven to be erected in a light p ace where it can be prol iprly inspected and properly cleaned.

e special arrangement of the auxiliaryburnereframe shown in Fig. 5, consists of the auxiliary frame-bars a sustained by standards a upon the frames at, and each having rings u. attached thereto to loosely support 5 the upper ends of the burners so that too burners may be readily removed at pleasure.

Baffle-plates 2 are shown in Figs. 3 and 6, supported over the burners, in the o ening d in the bottom of the oven, by framears 3 to which they are secured and which are supported at intervals upon the bottom by crossbars 4. Such construction makes a unit of all the bafli'e-plates and holds them detachably in place so that they may be lifted or removed at any time for access to the tops of the burners.

The bodies of the burners which in practice are made with theusual wire gauze at the top, are made detachable by support upon transverse branches 5 of the gas supply-pipe 6, the

body of each burner being notche at the bottom as shown in Fig. 3, to straddle the branch-pipe 5, and the bottom of the burner being supplied with air by a perforated cup 7 suspended upon the branch-pipe.

The bodies of the burners being held loosely upon the branch-pipes and loosely in the rings a are thus readily removable.

Having thus set forth the nature of the invention what is claimed herein is:

1. The combination, withthe casing containing the baking chamber provided with a longitudinal opening in the bottom, of a series of burners situated beneath said chamber and communicating with said opening, means for inde endently regulating said burners, baffle-p ates situated above said burners, and a removable support for said baffle-plates.

2. The combination, with the casing containing a baking chamber provided with a longitudinal openin in the bottom, of a series of burners situated beneath said chamber and communicating with said opening, means for inde endently regulating said burners, baffle-p ates situated above said burners, wheels rotated within the casing adjacent to the heads with pivots thereon and shelf-hangers suspended from the pivots, angle tie-bars connecting the opposite edges of the shelfhangers, and gratings supported detachably upon the angle-bars to form the shelves, wit 1 the vertical flanges of the an le-bars projected above the rating, wiereby such flanges perform the ouble function of hold ing the gratings detachably upon the bars and of maintaining the baking pans in place when set upon the gratings.

3. A portable revolving bakers gas-oven, comprising a sheet-metal casing having sides and heads with a shaft extended through the heads, wheels secured to the shaft near the heads of the casing with pivots thereon and shelves suspended from the pivots, a door in the side of the casing, a longitudinal opening in the bottom of the casing, a series of gas burners discharging their heated gases into the easin and flue-plates attached to the heads of t 1e casing forming a downward flue with inlet at the top of each flue for the entrance of the condensed gases, and outlet at the bottom for discharging such gases.

4; A portable revolving'bakers gas-oven,- comprismg a sheet-metal casing having sides and eads with a shaft extended through the heads, wheels secured to the shaft near the heads of the casing with pivots thereon and shelves suspended from the pivots, a door in the side of the casing, a longitudinal opening in the floor of the casing, a row of gas burners discharging their heated gases into the 0 ening exce ting near the ends, and flue-p ates attache to the heads of the casingforminga downward flue with inlet at the top and sides for the entrance of the condensed gases, and outlet at the bottom for discharging such gases through the ends of the opening in the floor of the casing.

5. A portable revolving bakers gas-oven,

comprising a casing having the sides. formed of double Walls of sheet-metal with an intervening layer of incombustible and non-heat conductin [material to resist radiation of heat, and eads formed of metal only to permit radiation of heat, a reel having sus ended shelves rotated within the casing, a oor in the side of the casing for access to the shelves, gas burners dischargin their heated gases into the casing, and out heads. In testimony whereof I have hereunto set my hand in the presence of two subscribing et flues-for the con-- "densed gases contiguous to the metallic 

